关键词: 多金属氧酸盐, 丙酮, 水热合成, 晶体结构, 催化性能

Abstract:

A novel compound, (C5H7N2)3(AsMo12O40)·3C5H6N2·2H2O, has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, IR, UV/Vis and TG-DTA. Using catalytic elimination reaction of acetone as a model reaction, the catalytic performance of the title compound has been tested. The results indicate that the structure of the title compound consists of [AsMo12O40]3- heteropolyoxoanion, [C5H7N2]+ cations, [C5H6N2] molecules and water molecules. The compound crystallizes in the monoclinic, space group P21/n, a=1.33820(12) nm，b=2.2542(2) nm，c=1.9848(2) nm，β=100.27(3) °，V=5.891 2(10) nm3，Z=4，Rgt(F)=0.0590，wRref(F2)=0.1882. The compound has a good catalytic activity for the elimination of acetone. When the initial concentration of acetone is 1.3 g/m3 in the air with a flow velocity of 4.5 mL/min, the acetone is completely eliminated at 160 ℃ over 0.20 g of the title compound.

Key words: polyoxometalate, acetone, hydrothermal synthesis, crystal structure, catalytic performance